Spool



SPOOL Filed'May 31, 1921 Patented Jan. 15, 1924.

UNITED STATES 1,431,190 PATENT OFFICE.

VERNON DURBIN. OF NEWTON. AND GEORGE E. BICKELL. OF BROOKLINE, MASSA- CHUSETTS, ASSIGNOBS TO THE HOLTZER-CABOT ELECTRIC COMPANY, OF ROXBURY, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SPOOL.

Application filed May 31, 1921.

Be it known that we, VERNON Dt'inax and Giaoiroi: H. BICKELL. a citizen of the United States, residing at Newton. in the county of Middlesex and Commonwealth of Massachusetts. and a subject of the King of Great Britain. residing at Brookline. in the county of Norfolk and Commonwealth of Massachusetts. respectively, have invented certain new and useful Improvements inSpools; and we do hereby declare the following to be a full, clear and exact description of the invention. such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to spools and more particularly to spools adapted for supporting the winding of electro-n'iagnets of the type employed in electric bells. buzzers. relays, transformers. and a wide variety of similar apparatus.

The object of the present invention is to provide a relatively simple and inexpensive form of spool for electro-magnets which is of such a character that it may be readily assembled from the component parts when it is desired to use the spool as the base for an electro-magnet coil.

lVith this object in view the several features of the invention consist in certain novel features of construction, combinations and arrangements of parts hereinafter described and claimed. the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings illustrating the preferred form of the invention Fig. 1 is a view illustrating one of the end members for the spool; Fig. 2 is a detail illustrating one of the spacer bars which form the barrel of the spool; Fig. 3 is a detail illustrating the end members and bars assembled; Fig. 1 is a View of the spool illustrat ing the latter after the paper strip forming the barrel has been partially wound thereon} and Fig. 5 illustrates the completed spool when employed as a base for an electromagnetic winding.

According to the present invention the new form of spool may be readily and .quickly assembled when it is desired to use it and prior to that time the several parts of the spools are stored in disassembled relation, thus occupying aminimum of space Serial No. 473,750.

and materially reducing the cost of handling. The spool comprises essentially two end members 01' heads of paper or similar material. which are connected by metal bars.

extending lengthwise of the completed spool and having outturned opposite ends. which cooperate with a strip of paper or similar material wound about the bars to maintain the heads in the proper spaced relation. The end members and bars forming the barrel of the spool may be readily assembled with one another through the provision of openings formed in the end members and of substantially the same width as the bars. The end members and the bars are locked in the assembled relation shown in Fig. 3 through the provision of locking lugs formed upon the bars. which are seated in recesses formed in the end members when the latter are held in spaced relation by the insertion of the paper strip therebetween.

Upon referring to the drawings it will be observedthat each spool comprises essentially two end members or heads 10, two cooperating spacer members or bars 12 and a paper strip 14 of predetermined width, which cooperates with'the metal bars 12 to form the barrel of the spool. Each of the end members may have substantially the form shown in Fig. 1 and is provided with a centrally located opening 16 of rectangular form having locking recesses 18 formed at the opposite corners. Each of the metal spacer members 12 is provided with laterally turned flanges or end portions 20 and with locking lugs 22 adjacent thereto. The spacer members are of substantially the same width as the width of the openings 16 in the end members and are designed in such a manner that with the spacer member in serted in the opening with the laterally extended end 20 engaging with the end member as shown in Fig. 3,-the locking lugs 22 are seated in the cooperating recesses 18. thus retaining the spacer members 12 spaced apart in'the relative position shown in Fig. 3. In order to retain the spaced relation of the end members 12 and in addition to com-- plete the barrel of the spool and provide an insulating support for the electro-magnet winding. a flexible paper strip 14 is wound about the spacer members between the heads, as indicated" in Fig. 4, this strip being of such width that it tends to force the end members against the flanges 20 when it is wound onto the spacer members between the heads. With such a construction it will be obvious to those skilled in the art that the spools may be readily assembled as needed and that prior to such assembling the component parts are of such a character as to occupya minimnm'ot space. lln assembling the spool. as shown clearly in the drawings, two end members and two spacer members are assembled by inserting the spacer members through the openings in the end members. which are then drawn apart to cause the engagement of the locking lugs in the recesses. lln this position the strip 14 is wound about the spacer members to retain the heads in the position shown and provide a complete spool which is especially adapted for small electro-magnet coils. After the spool has been completed, the coil may be wound thereon in any desired manner to form a completed Winding, as shown in Fig. 5, the ends of which may conveniently project through openings 30 previously formed in the end members. In employing a spool of this character for an electro-magnet the spool may be directly assembled on the square mandrel of the winding machine from which the completed electro-magnet may be easily removed when the winding operation is finished. I.

est-amen While it is preferred to employ the specific construction and arrangement 01 partsshown and described it will be understood that this construction and arrangement is not essential except so far as speciticd in the claims and may be changed or modified Without departing from the broader features of the invention.

The invention having been described.\\'hat is claimed is:

A spool comprising two end members for heads. two spacer bars and a spacer strip. the heads having rectangular openings. two opposite sides of the opening having locking notches located adjacent to the ends of such sides. the other two sides of the open ing being )lain sides. the spacer bars haw ing a Wiclt equal to the length of the plain sides and being provided with end flanges to engage the heads and hold them from outward movement on the bars. said bars being also provided on each edge adjacent to the flange with looking lugs adapted to be received in the locking notches ot' the heads, the spacer strip acting to hold the heads against the flanges ot' the spacer bars and thereby to hold the locking lugs inthe locl ing notches" so that the bars cannot collapse by movement toward each other.

VERNON DUlRBlN. GEORGE H. BICKELL. 

